锌负极用锌酸钙的电化学制备法及其性能研究  

Preparation of calcium zincate as zinc anode by electrochemical method and its electrochemical performance

作　　者：穆培振 李加勇 崔超群[2] 马兆瑞 宋光亮 

机构地区：[1]河南新太行电源有限公司,河南新乡453002 [2]中国人民解放军空军驻新乡地区军事代表室,河南新乡453002

出　　处：《电源技术》2015年第6期1279-1281,1326,共4页Chinese Journal of Power Sources

摘　　要：采用隔膜式电解槽,以含Ca（OH）2的KOH溶液为电解液、金属锌为阳极、泡沫镍为阴极,经直流电电解制备出纯度在93%~97%、可用于二次锌负极的锌酸钙。采用粉末X射线衍射光谱法（XRD）、能量散射光谱（EDS）、差热-热重分析（TG-DSC）、扫描电子显微镜法（SEM）、粉未微电极CV特性、锌/镍实验电池充放电等方法对所制锌酸钙进行了表征与测试。结果表明电解法所制锌酸钙的化学组成为Ca[Zn（OH）3]2·2 H2O,晶体形貌为菱形,还原电位和氧化电位分别为-1.42和-1.33 V（vs.Hg/Hg O）,实际放电比容量可达243.2 m Ah/g,循环35周后的容量保持率可达95%。The calcium zincate crystal with the purity of 93%-97% was obtained by electrolyzing zinc anode and nickel foam cathode using KOH solution with Ca（OH）2as electrolyte in a diaphragm electrolyzer. The sample was characterized by powder XRD,EDS,TG-DSC,SEM,cyclic voltammetry of microelectrode and charge-discharge test of simulated Zn/Ni battery. The results show that the chemical composition of the sample is Ca[Zn（OH）3]2·2 H2O; the morphologies of calcium zincate single crystal is tetragonal; the reduction and oxidation potentials are-1.42 and-1.33 V（vs.Hg/Hg O）,respectively. The discharge specific capacity is 243.2 m Ah/g,and the capacity retention is95% after 35 cycles.

关 键 词：电化学合成法 放电平台 锌酸钙 锌镍电池 循环伏安法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]